Jack



l. A. WEAVER April 5, 1932.

J ACK Filed May 11, 1929 5 Sheets-Sheet 1 April 5', 1932.

. I. A. WEAVER JACK Filed Maly 11. 1929 3 Sheets-Sheet l otent l 1932STATES PATENT OFFIC ill. Wnnrnn, t3! SIPM'N'GI'IELF, ILLIIN' U18,ABSIGINOB 1'0 WEAVER. MANUFAUIUIE- Il'ilt'fil (90mm, 01'' SPBHWGIHIELD,ELINOIB, A CORPORATION 01" ILLINOIH Application allot flay ll,

'lllie present invention relates more particulorly to truck-j acke oithe hyclraulic type, the oererol features of novelty and improvementresiding more or less in the structural I "r elierocteristics oi themechanical elements eniplo yerinnol in their cooperation with onennotlrer, one of the prime time oil the inven tion loeing the provisionor 9; incl: of this type which in comperetirely simple in etruetnre,Willfiil possesses greet lilting power tor ite; nine rrntl "which canlie operetecl with relative ease enel Facility, other features oiadvantage out which will ioecorne apparent from o eon eieleretion epresent, preterreil emcliinent oi? the intention illnetraterl in the noeonrpnnying drawings, forming e art of thin e rreeilieetion, enrlthroughout t e severel rierre out which lilre reierence ntlmernle havebeen employed to designate the see ports.

'"lreoe elretringe: irgnre l in n, eicle elevntion oil the irnprorerlncl: showing the loerl-earlelle in 'll'l its lowermost position inflotterl in most elerntecl reletioni m lfilltt') F in plnn riew of thejTeclr ehown in ll, operating handle being trolcen ltrngrnentery entlelevation oil pnrtr were we l trorn line it control, "rertieel,longitnriinnl i e Figure in;

l more 8 is n fragmentary, lo llwine flee tion on on enlergecl ecele onthe line it-F out Figure l; v

Figure '2" is o cross-section on enlncreheel ncnlc on line 1?'--l oiFigure't; T

Figure t in en elevation of the handle equipped enel o'l' tlre jock;

Figure 9 in on enlerget section of lineg9-9 figure 2;

til

tion on line ill-ill of El re tlgnml Figure 11 in on amplified.fietailssction ehowing the bell-valves controlling the oper-' etion oithe oil-pump.

By reference to these drawings, it will be l reg-ore ill in e we ifierln rtiul x gm Mp upstanding, reto mngiprojections or loge 10 mm Io. QMWO.

permit oi its reinforcement at this point not to nllow tlle loaiisaolrlle to descent to a greet or extent, not the enol oi the element 21is somewhat flattened horirzsontall'y onol slottefl along its oppositesides to provicle upper anal lower terminal sections and Q5 whichreceive between them tlie aentral portion oin t3ll'0BS-llfll E26pivoterl on an upright bolt 2'? ant enpplieol at ite opposite enols witheppro printe carrying-wheels 28, 28"

[in order to strengthen such pert oi the en plinnce, tile tu'hnlnr mernoer is proriclecl internelly with n reinforcing block or bar shopecl toconform to and bearing on the in nor, lower surface of tire element 21!,being welrlei, ri'veterl, or otherwise eecnrorl in no eition, enclr part29 having a tilnrceteil encl prorirling two eere Fl end 552 osecllietrreen tire ripper enel lower enrineee oi the leer Flt encl timenfiieeent inces of tire cylinfler eeetions end Q5, time pirotliolt 2?"extending thronglr registering apertures; in all live porter,

, ell no in elenrllt renown in Fignre l.

In order to maintain the seat or safldle always practically horizontalin all of its various degrees of elevation, a link 42 of proper Flt 49therethrough normally closed by a screw 51, leading inwardly to the hallraceway 47 and of a size to permit the introduction or extraction ofonly one of such balls at a time,

provided the plug is removed for thatpura suitably-packed power-piston73 adapted pose, the set of such balls also fitting in a concave,circular raceway 52 in the shank of a caster-yoke 53 in which acaster-wheel 54 is mountedto revolve in usual manner.

From this description, it will be clear that each one of suchball-bearings is completely protected from dirt and water and that theballs themselves act as a retaining means for the shank of thecaster-wheel yoke in the recess provided in the supporting member 45.

In assembling these parts, the upright caster-wheel journal or stem isintroduced into the vertical bearing in the bracket so that the tworaceways are in register, whereupon the balls are inserted individuallyin succession through the aperture 49 until they have all beenintroduced into place, whereupon the plug 51'is inserted to preventtheir unintentional removal.

This construction provides a simple means for a protected and shieldedball-bearing, the

members of which cannot become accidentally separated, and which isfully and completely fortified or preserved from foreign matter reachingit, particularly from above,

. it being understood that these jacks are somecommodated between a pairof retaining straps 57 riveted against the opposite sides of the shankof a link 58 having in its corresponding end a substantiallysemi-circular recess 59 forming abearing for the part 56.

The link or connecting-rod 58 has a vertically-flattened enlargement 61of substantially the same diameter as the internal calibre of thecylinder 21, such part 61 being rounded on its top and bottom tomaintain a snug fit 1n the cylinder in its various positions ofoscillation and to take at least a part of the strains.

This enlargement 61 has a cavity 62 and aligned hearings for the journal63, 63 of a cross-shaft 64 flattened on one side at 65, the roundedportion of the shaft conforming to and bearing on the companion, curvedsurface 66 at the inner end of the recess 62.

Cylinder 21 is provided internally with a stationary, division wall 67expanded to form a tight fit therewith, so that there is a fluid tightconnection between the Wall and the cylinder, the former being centrallyapertured and equipped with a stuffing-box 68 for the accommodation of areciprocatory pistonrod 69, the flat end 71 of which bears against theplane face of the shaft 64, such rod 69 having an annular groove 72around it which receives the inner end of a retaining screw 73 extendedthrough the part 61 to hold the link or connecting-rod 58 in operativeassociation with the piston-rod 69.

At its other end, the piston-rod 69 carries to fit and to reciprocate inthe cylinder.

The adjacent end of the cylinder is internally threaded and accommodatesa screwthreaded disk or plug 74 equipped with apair of threaded studs75, 75 extended out through apertures 76 in an end-cap 77 having aflared mouth 78 fitted closely over the corresponding, external,converging or tapered surface 7 9 on the endof the cylinder 21, nuts 81on the studs, with intervening washers 82, drawing the parts firmlytogether, so that there is a very tight and accurate fit between the capand the outer surface of the cylinder, the construction being such thatthe parts can be readily demounted, or separated, if neces sary, toafford access to the inside of the appliance. Cap 77, in its lowerportion, has a longitudinal, cylindrical cavit 83 accommodating aconformable, slidab e, suitably-packed plunger 84 extending out of thecasting 77 through a stuffing-box 85, the protruding end of the plungerbeing connected by a pair of links 86, 86 through spacers 87, 87 and ashaft 88 to the two arms 89, 89 of a yoke 91, oscillatory on a shaft 92,supported in bearings 93, 93 of a forked portion 94 of the end casting 77, a coiled, torsional spring 95 surrounding that portion of the shaft92 between the sides of the section 94 of the casting and one end 96hearing against the casting and its other end 97 underlying the web ofthe yoke 91,-as is clearly indicated in Figure 8.

Thus the spring tends to rock the parts in a direction to draw thepump-plunger 84 to its outermost position, another yoke 98, embracingthe yoke 91, being also rockable on the shaft 92 and its center providedwith an upstanding rod or stud shaft 99 and encasing sleeve 101 weldedto the yoke a tubular handle or lever 102, equipped with a top cross-bar103, at its lower end extending through an aperture of, and welded to, abent arm 104, oscillatory on the member 101 and mo'vably held to theyoke 98 by a clip fastened to the latter.

Arm 104 has a ball and socket connection 105 with a rod 106 pivotallyconnected at 107 with an arm 108 rigid with the cross-bar 26,

narrates the construction being such that the turning ot' the handle orlever 102 103 about its own unis roclrs the her 26 and the wheels 28around the tulcruna bolt 21 to sheet the desired steerot thetruclnjaclr.

l urningr to Figure 11, it will be noted that the plug or dish 74 has apassage 109 therethrouph so that the oil or other liquid from the pumpdid-d4 may pass to the powercylinder 21 and may also flow back to theoil-reservoir to the right of the power-piston when permitted to'do so.

The end ol the pump-eylinder 83 is made tapering at 111 to receive acorrespondinglyshaped valve-plug 112 having a side port 118 controlledhy a ball-checkwalve 114 in a larger, cross passage 115 which intersectsa longitudinal conduit 116 opening at one end into the puinp eylinder 83and connecting at its other end with a port 117 opened and closed by aball check-valve 118 and extended heyond the adjacent surface 119 oilthe castin s" W, whereloy the liquid trons the pumpnder may be deliveredthrough the port into the conduit 109.

1131s in direct connection with a pas- 121 in the casting 1''? leadingto a transverse cavity 122 in its lower part (Fig. '1" which, by anotherpassage 123, in direct association with an external pipe or conduit 124leading to a connection 125 6) and a port 126 through the cylinder-wall,which port is adapt-ed to be opened and closed by a- Ll vtl 12'? ridingon the corresponding porin the inner surtace ot the cylinder 21 ai ing alongitudinally and transversely connection with the power piston '23 anattachment screw 128 smaller in on throu chains-er 122- 1'} has a duringwhich receives a taperedvalvehaving an annular groove 132 connecteddiametrically-oppo L xi lay a cross-passage 183 which also rsectslongitudinal cavity 134 in the 1 r equipped a valve-seat and balli e135.,

tr "l'l is also tarnished with a passage 111th h igs. d and l) whichconnects the space hetween the elements 7 4 and 77 with the an nu 11"groove 132 allowing the ball-valve 135 t be employed to govern orcontrol the de scent oil the lifting-member of the jack.

he hallvalve 185 is normally held closed on seat lay a plunger 137,slidable lontudinally in a plurality of aligned apertures in series ofplugs 138, 188 screwed into one threaded end of the chamber 122, acoiled spring 139, encircling the rod 137',

pressing at one end against the innermost plug; 13% and hearing at itsother end against trusted against the action of such spring, theball-valve will be permitted to open automatically and to establish aconnection between that portion of the cylinder 21 to the left of thepower-piston 73 and that part of the same cylinder to the right of suchpiston.

To draw back or retract such spring-actuated, holding member, a bentlever 141 is tulcrurned on the cap-casting 77 at 142, its slotted,depending extension 143 (Fig. 9) straddling the rod 187 adjacent to aterminal not 144 screwed on to its threaded outer end, the tree upturnedend portion 145 (Fig. 1) of the arm 141 overlapping the outer face of afoot-lever 146 (Fig, 8) having a hub 147 oscillatory and also lengthwiseslidahle on theshaft 92, such lever having a foot-piece 148' and aprojection 149 over lying the front edge of one of the bracket arms 89.

11 such short-stroke pedal 148 is rocked upwardly and downwardly hy thefoot, which can be accomplished much more rapidly than thecorresponding" hand movement of the handle or lever 102, the pump can beactuated relatively more speedily to secure a quick initial rise of theloadsaddle.

During; such actuation of the t'ootdever 146, the handle 102 remainsstationary, the yoke 91 being automatically restored to position by thespring 95 after each down-rockmg movement by the toot-lever Thisconstitutes a simple and effective means for securing a rapid,preliminary, upward travel of the seat to the load.

rln auxiliary handle 151, (li'ia. E3) is pivoted to the lever 102 at 152and is connected by a link 153 to a slotted cam 154 through which theshaft 92 extends.

"When handle 1211 is down as shown in Figure 8, valve 135 remains closedowing to the pressure o'l the plunger 13? against it, hut when it isdesired to lower the load, the handle 151 is swung upwardly therebylitting the cam 154 and shifting the lever 146 on and lengthwise of theshatt 92, with a complementary rocking movement of the lever 141',whichretracts the plunger 13'? from the ball-valve 135, allowing the latterto open, thus permitting the oil to flow from the cylinder 21 on oneside of the powcr-piston 73 to the same cylinder on the opposite side ofsuch piston.

The jack is operated practically as follows, assuming that it has beenrolled to correct position with its seat or saddle directly helow theload to be lifted:

The operator, by his foot, Works the pedal 146148 up and down severaltimes, comparatively rapidly, at each upward actuation, causing thepump-plunger 84 to travel to the left, which movement sucks oil into thepum -cylinder 83 from the oil reservoir in cylin or 21 to the right ofthe powerpiston'73 through port 126, connection 125, conduit 124,passage 123, chamber 122, aperture 121 and port 113, the ball-valve 114automatically opening under such circumstances, and each time thefoot-lever is rocked down, effecting the inward travel of the plunger84, such charge of oil reviously drawn into the cylinder 83 being orcedout thereof through passage 116, port 117- and aperture 109 into thecylinder 21 to the left of the power-piston 73, which it forces along acorrespondln amount to the right, the swift foot working of the leverresulting in a relatively-quick ascent of the seat or saddle to theload.

Then greater power is required to lift the load step-by-step and this isaccomplished by more slowly rocking the longer handle 102, 103 up anddown the required number of times, thus operating the same pump at areduced speed.

When the load-saddle and the bell-crank lever reach their uppermostositions, piston '7 3 will have moved sufficient y to cause valve 127 tocover port 126 over which it is firmly held by suction, if operation ofthe pump is continued, thus shutting off the supply of oilto the pump,which action precludes fur er elevation of the load.

To lower the saddle and its load at a substantially definite orpredetermined low speed .or-rate, the workman swings handle 151upwardly, thereby allowing valve 135 to open automatically by reason ofthe oil pressure acting on it, and permitting the oil on the left-handside of the power-piston to flow to its other side, such oil transferletting the load and saddle or seat gradually descend the requiredamount usually to its lowermost position, valve 127, by reason of itsloose mounting on the piston, readily opening upwardly to allow such oilflow. Y

- It will be noted that oilunder substantial pressure is present only inthe pump cylinder 83 and in the power-cylinder to the left of thepower-piston 73, the chamber to the right of the power-piston comprisingan oil reservoir one wall of which is formed by the plug or closure v67v The latter is held in place in the tubularmember or cylindrical shellsolely by friction,

i and, to obtain such a suitable fit the member 67 has two flaring wallsequipped around their peripheries with a small amount of packingmaterial.

After the part 67 has been properly positioned its diverging walls aresqueezed toward one another, thus enlarging its diameter adequately toobtain'the required frictional The packing, which is employed in groovesaround the member, is used merely as a safeguard to assure completeclosing of any scores on the inside of the cylinder.

Although herein only one desirable embodiment of the invention has beenresented, those acquainted with this art wi understand that it is suscetible of incorporareadily 7 tion in physical forms di eringsubstantially from one another in mechanical details.

In some cases it may be desirable to employ a coiled spring 200 bearingon the piston or plunger 73 to assist in returning the loadsaddle to itslowermost position, but, in other instances, such spring may possibly bedispensed'with. v

I claim:

1. In a lifting-jack, the combination of a tapered plug hav1n a sideinlet-port and a side outlet-port an a. longitudinal passage connectingsaid ports together and open at one end of the plug, check-valvescontrolling said two side ports, a hollow pump-cylinder having a taperedend recess adapted to receive said plug, a plunger reciprocatory in saidcylinder, and means to operate said plunger.

2. In a lifting-jack, the combination of a. substantially-horizontalhollow cylinder, a. bell-crank lever fulcrumed on the jack, aload-saddle mounted on said lever, a powerpiston slidable inside of saidcylinder, a liquid pum connected to said cylinder and adapted to slidesaid piston inv said cylinder to raise said lever and load-saddle, meansto release the liquid in said cylinder to permit descent of said leverand saddle, and means connecting said power-piston and bell-crank leverincluding a rocking-link having a rocking and sliding bearing'on theinner surface of said cylinder.

3. In a lifting-jack, the combination of a substantially-horizontalhollow cylinder, a bell-crank lever fulcrumed on the jack, a load saddlemounted on said lever, a power-piston slidable inside of said cylinder,a liquid pump connected to said cylinder and adapted to slide said-piston in said cylinder to raise said lever and load-saddle, means torelease I the liquid in said cylinder to permit descent of said leverand saddle, and means connecting said power-piston and bell-crank leverincluding a link having sliding and rocking bearings on the top andbottom inner surfaces of said cylinder.

4. In a lifting-jack, the combination of a substantially-horizontalhollow cylinder, a lever fulcrumed on the jack, a load-saddle mounted onsaid lever, a power-piston slidable in said cylinder, a piston-rod onwhich said power-piston is mounted, closures for said cylinder throughone of which said piston-rod extends, a link hinged to said lever, across-shaft rockingly mounted in said link and having a flat face, theplane end of said piston-rod bearing on said flat face, a liquidpumpconnected-to said cylinder and adapted to slide said piston in saidcylinder to' raise descent of said lever and saddle;

5. In a lifting-jack, the combination of a substantially-horizontaltubular-member, a lever fulcrumed on said jack, a load-saddle mounted onsaid lever, spaced closures for said tubular-member forming apower-cylim der between them, one of said closures being apertured andheld in place solely by its friction with the inner surface of saidtubularmember, a piston-rod slidable through said aperture, meansoperatively connecting said piston-rod and lever a power-piston on saidpiston-rod and slidable in said power-cylinder, and means to effect thereciprocation of said powe1 -piston in said power-cylinder to raise andlower said lever and load-saddle.

6. In a lifting-jack, the combination of a substantially-horizontaltubular-member slotted along a portion of its top, carryingwheels forsaid member, a bell-crank lever fulcrumed on said member and occupyingsaid. slot, a load-saddle mounted on said lever, a closure for an end ofsaid tubular-member, an apertured closure for an intermediate unslottedsection of said tubular-member and held in place in the latter solely byits friction with the inner surface of said member, a piston-rodslidable through said aperture, a stuffing-box on said apertured closurecooperating with said piston-rod, a link con-. necting said piston-rodand bell-crank lever, a piston on said iston-rod and slidable in saidtubular-memher between said closures, a pump to force liquid into saidtubularmember between said end-closure and said piston to eflect travelof the latter to raise said bell-crank lever and load-saddle, and meansto release the liquid from such chamber to allow descent of saidbell-crank lever and said load-saddle.

7. In a lifting-jack, the combination of a substantially-horizontalhollow cylinder, carrying-wheels for said cylinder, said cylinder havingan exterior tapered surface at one internally screw-threaded endthereof, a threaded plug in said cylinder and engagin saidscrew-threads, an end-closure for said cylinder having an inner taperedsurface fitting over and bearing on said complementary tapered surfaceof said cylinder, means detachably securing said plug and closuretogether, a division-wall fixed in said cylinder dividing it intolongitudinal sections, a power-piston fittin and slidablein saidcylinder between saif plug and division-wall,

a piston-rod, on which said piston is mounted and slidable through anaperture in said In witness whereof I have hereunto set my hand.

IRA A. WEAVER.

division-wall, a load-saddle near one end of the jack, means operativelyconnecting said piston-rod and load-saddle, a pump having valved conduitconnections with the liqui reservoir between said piston anddivisionwall and with the power-cylinder between said piston and plug,means to operate said pump to cause said load-saddle to rise, and meansto connect said power-cylinder with

